Verifying to answer your question has shown I overlooked the role grants...
So, there is no problem with the grants to roles, you can close this ticket.
Reasons I missed them are :
- in Schema compare for Oracle, both grants to users and roles are grouped together while in SC for Oracle the are separate.
- Due to the lack of sort functionality on the screen, and the fact they were very far from each other in a long list of objects (initial load into subversion), I found the grants to user, but overlooked the grants to roles.
Sorry for my misstake,